Split bolt with protruding pivot pin to provide a stop shoulder



y 1958 J. H. DEVINE 2,836,095

SPLIT BOLT WITH PROTRUDING PIVOT PIN TO PROVIDE A STOP SHOULDER FiledSept. 28, 1954 2 Sheets-Sheet 1 I 36 FIG-l- 2O 2| 32 FIG-3- 3O 32 22FIG-8' Q 1 3o 40 20b 22b I 1 A" & 200 220 INVENTOR JAMES HENRY DEVINE BY@MQW ATTORNEY y 1958 J. H. DEVINE 2,836,095

SPLIT BOLT WITH PROTRUDING PIVOT PIN TO PROVIDE A STOP SHOULDER FiledSept. 28, 1954 2 Sheets-Sheet 2 INVENTOR JA MES HENRY DEVINE ATTORNEYSPLIT BOLT WHH PROTRUDING PIVOT PIN TO PROVHDE A STOP SHOULDER James H.Devine, Washington, D. C.

Application September 28, 1954, Serial No. 458,804

3 Claims. (Cl. 85-1) This invention relates generally to bolts, and moreparticularly to blind bolts, that is, bolts that are used to secure,hold, or look one material, such as a plate, to another when access isnot had to one of the boltcontacting surfaces of one of the plates ormaterials, such as the back surface of a wall, referred to hereinafteras a blind surface.

The present invention is an improvement on the inventions disclosed andclaimed in my co-pending applications, Serial No. 241,029, filed August9, 1951, and Serial No. 315,702, filed October 20, 1952, and in myco-pending application, Serial No. 441,214, filed July 6, 1954 nowPatent No. 2,804,796.

The bolts described in the first two of the cited applications are ofthree types: a solid bolt, a slide bolt, and a spread bolt, the solidbolt being made of a single piece of material, the slide bolt of twocooperating component parts pivoted on each other, and the spread boltof two or more parts pivoted one on each other, to form a unit bolt. Inthe slide bolt, fiat surfaces of the shanks slide one on the other asthe bolt parts pivot one on the other to move from a collapsed condition(for insertion into holes of plates) to the expanded condition (forengaging the blind surface of one of the plates) to lock the plates ormaterials together. In the spread bolt, the flat surfaces of the shanksspread apart from each other as the parts pivot on each other to movefrom the collapsed to the expanded condition. Each of the three types ofbolts has the common construction characteristic of having at least onemember consisting of a tension-producing or threaded portion, definedhereinafter as the end of the bolt, and a tapered shank extendingaxially therefrom, which shank has a flat surface or toe extendinglaterally from the shank to engage a blind surface. When the bolt isinserted in holes in plates in its collapsed condition, it has noengaging head as such, but in its expanded condition, the toe or toesform an engaging head. In each of the types of these bolts in said priorinventions, the end of the bolt is larger in diameter than the shank,whereby an overhanging ledge is formed in the plane common to the endand the shank, to contact the outer surface of the exposed plate,referred to hereinafter as the exposed surface. The ledge prevents thebolt from passing through the holes in the plates and also forms a pivoton which the parts of the bolt pivot to move from the collapsedcondition to the expanded condition. The pivot of the bolt, whether itbe only the ledge of the solid bolt or the ledge and a ball or othertype of pivot of the slide or spread bolt, is in the plane approximatelycommon to the end and the shank, which plane is referred to hereinafteras the pivot plane.

The bolts disclosed in the third of the cited applications relate to thesame three types of bolts and are characterized further by the shanksbeing of the same diameter as the threaded ends so that there is nointegral ledge formed in the pivot plane of the bolt itself. Also, the

tates Paten ice shanks are preferably threaded partially along theirlengths. These bolts have a groove substantially in the pivot plane inwhich groove is positioned a protruding ring that engages the rim of thehole in the exposed surface to prevent the bolt from passing through thehole. This ring is capable of being forced into the groove by a nut, asthe nut is screwed down over the ring and screwed on along the shankafter the nut engages the exposed surface and the bolt is placed undertension.

The present invention provides means, other than the said ledges orrings, for preventing the bolts of my prior inventions from passingthrough a bolt hole and for providing a pivot upon which the solid boltor the component parts of the slide or spread bolt pivot on the exposedsurface. Examples of such means, as disclosed herein, consist of aprotrusion or a plurality of protrusions formed on the surface of thesingle member of the solid type bolt or on the surfaces of the componentparts of the slide or spread types of bolts, or the protrusions mayconsist of an end or the two ends of the pivot of the bolt, upon whichpivot the parts one on the other, the pivot extending beyond the surfaceof the bolt.

These protrusions are preferably formed on the solid bolt or componentparts of the slide or spread bolt at the time that the bolt is made, asfor example when made by forging or casting or by a cold flow process.The protrusions are formed substantially in the pivot plane of the boltand extend from their contiguous surfaces at distance sufficient toengage the rim of the hole in the exposed surface.

As the taper of the shank begins at the pivot plane and as the diameterof the shank at that pivot plane is substantially equal to the diameteror" the hole in which the bolt is to be used, only one protrusion permember or part is actually required to keep the solid bolt or the partsof the slide or spread bolt, respectively, from passing through the bolthole. If only one protrusion is provided, it is preferably located inthe axial longitudinal plane of the bolt that passes through the toe onthe shank, as the protrusion acts as a pivot for the bolt to change fromits collapsed condition to its expanded condition. When the pivot pointis in this plane the weight of or the momentum of the bolt as it isinserted in the bolt hole will tend to move the bolt from its collapsedcondition to its expanded condition.

The principal object of this invention is to provide, in substantiallythe pivot plane of a blind bolt of my inventions, means to prevent thebolt from pasisng through the holes in the plates or other materialswhich are to be bolted together.

Other objects of the invention are to provide, in substantially thepivot plane of a slide or spread bolt of my inventions, a pivot havingsuch dimensions as to extend beyond the normal surface of the bolt 1) toform a protrusion or protrusions to prevent the bolt from passingthrough the bolt holes, (2) to form a pivot for the parts to pivot oneon another, and (3) to form a pivot for the parts to pivot on theexposed surface.

Other objects of the invention will be apparent from the description ofthe invention as hereinafter set forth in detail and from the drawingsmade a part thereof, in which:

Figure 1 is a view in cross section of a solid bolt of my inventionhaving four protrusions thereon, the bolt being in position to engageand hold together two plates;

Figure 2 is a view in cross section of the bolt shown in Figure 1, takenon line 22;

Figure 3 is a view similar to that of Figure 2, but with the bolt havingonly one protrusion;

Figure 4 is a view in elevation showing a slide bolt Figure 8, taken online 99;

' the plates 39 and 28.

. a lla ed son tion reads? to se t d n o ah e in'two plates; V

Figure 5 is a view in elevation of a slide bolt, having four protrusionsthereon, and in its expandedcondition and being in position to engagetwo plates, and with the 'toes in position to engage the blind surface,and with the bolt and the ends of the; pivot pin engaging the v exposedsurface of on'e of the plates; 7

Figure .9 is across section View of the bolt shown in Figure 10 is aview partly in cross section of a slide bolt in which the pivot is a pinintegral with one of the component parts of the bolt, which pin extendsbeyond the surface of the other part of the bolt, to form a protrusion,the bolt being about to engage in tension two plates; Y a

Figure 11 is a view partly'in cross section of a spread belt of myinvention having a pivot in the form of a pin that engages the parts ofthe bolt in bearings formed in the parts and engages. an exposedsurface;

Figure l2 is a view partly incross section of the bolt shown in Figure11, taken on line 12-12, and showing the pivot pin extending outside thesurface of the bolt;

Figure 13 is a view partially in cross sectionof a spread bolt with itspin pivot extending beyond the surface. of the bolt; 7

Figure 14 is a cross section view of the bolt shown in Figure 13, takenon line 14-14;

Figure 15 is a view partially in cross section of a spread bolt havinga'pivot consisting of a protuberance on one part engaging a recess inthe other part and a protrusion on each of the parts adapted to engagean exposed surface;

Figure 16 is a side elevation view of the right hand part of the boltshown in Figure 15;

Figure 17 is a view partly in cross section of a spread bolt the pivotof which consists'of a protuberance in one part that extends into theother part of the bolt and having a protrusion extending from theprotuberance adapted to engage an exposed surface;

Figure 18 is a side elevation view' of the left hand part of the boltshown in Figure 17; and

Figure 19 is a view. in cross section of the bolt shown in Figure l7.taken on line 1"--19.

Referring to Figures l, 2 and 3, a solid boltof my in vention,.showngenerally at 22), consists of a threaded end 21 and a tapered shank 22extending axially therefrom, on which shank is a fiat-surfaced toe, 24adapted to engage the blind surface 26 of the plates 28 and 30'. In thepivot plane of, the bolt are spaced protrusions 32 which are adapted toengage, the exposed surface 34 of exposed surface 34the bolt swings fiom the collapsed condition to the expanded or engaging position with toe24 opposite blind surface 26. j

in Figure 1, a'nut 36, with a recess 38 in one end thereof, is shown asscrewed down the head 21 with the' lower part clearing the protrusions32 and the lower'face' of the nut engaging the exposed surface 34. Whenthe nut 36 is screwed down farther, the bolt 20 is lifted until,-

toe 24 engages blind surface 26, and upon further screwing of the nut,the bolt 20 is placed under tension and a the plates 23 and are placedunder compression.

Referring to Figures 4.to 10, inclusive, each of the slide bolts showntherein consists of two component parts,

shown generally at ,20aand2tlb, pivoted on each other on pin to, eachpart with its end 21a or 21b, respectively,

its shank 22a or 22b, respectively, each shank with its toe 24a or 24b,respectively, and each part with protrusions 32 thereon substantially inthe pivot planes of the parts.

in Figure 4, thebolt is shown in its collapsed condition, poised overholes in plates 23 and 39, ready tobe inserted. in the holes of plates28 and 39.. In Figure. 5, the bolt of Figure 4 is shown, in its expandedconditionand about to One portion 23 of the shank 22 extends at thepivot plane and lies closely to theside walls of the holes in plates 28and 31) when the bolt is in its expanded condition, that is, in theposition for toe 24 to engage blind surface 26. The other portion of theshank 22 istapered longitudinally from the pivot plane of the bolt suchthat the greatest distance in bolt in the plane of the fiat surface ofthe toe is substantially equal to the diameter of the holes in plates2?: and 31}. it will thus be apparent that when the bolt is poised abovethe holes in plates 28 and 33 with its axis at an angle to the axis ofthe holes,

engage plates 23 and 30, with protrusions 32 engaging exposed surface 34and nut36 about. to engage plate 30. I

Referring to Figures 8 and,,9, the protrusions 32 are formed by makingthe pinetilong enough so as to exten beyond opposite surfaces of thebolt 2% Referring to Figure 10, the pivot pin .49 ismadeintegral withthe part 21b and extends through and beyond part 21a, to form theprotrusion 32r'only. The bolts shown in Figures 11 to 19, inclusive,illustrate the application of the present invention to the spread typeofbolts. The parts of thebolt shown in Figures 11 and 12 pivot on, eachother on pin 49, that engages journals 42, one in,

each part 21a and 215, respectively, the, journals 42 fitting intocorresponding recesses in its own other com; ponent part, as shownparticularly in Figure 12.

Referring to Figures 13 and 14, the pin 40 engages the two parts of thebolts in conical shaped holes 44in, the respective parts 21:: and 21b,the ends of the pin 40 extending beyond the surface of the bolt to formprotrusions 33.

Referring to Figures 15 and 16,1 the pivot between the parts 210 and 21bconsists of a protuberance 46 integral with part 21b, which protuberanceextends into recess 43 and'through hole as in part 21a,

bolt.

There is thus disclosed means for preventing a blind 7 bolt, such asdisclosed in the applications for patents cited hereinbefore, frompassing through holes in the 1' plates or other materials which are tobe bolted together.

There is also disclosed means to provide, in substantially the pivotplane of a slide or spread bolt disclosed in V the applications forpatents cited hereinbefore, a pivot having such dimensions as to extendbeyond thev normal that is, in its collapsed condition, the bolt can beinserted into the holes until the protrusions 32 projecting from thesurface of the bolt come into contact with the exposed surface 34. Upona protrusion 32 striking the surface of the bolt (1) to form aprotrusion or protru-' sions to prevent the bolt from passingthrough'the bolt f holes, (2) to form a pivot for the parts to pivot oneon another, and (3 to form a pivot for the parts to pivot on the exposedsurface. I

While the preferred embodiments of the invention have been illustratedand described by way of example, it will be obvious that changes may bemade therein within the spirit and scope of the invention and,therefore, the invention is not limited to the precise forms hereindisclosedf On the outer 7 surface and integral with protuberance 46 isprotrusion or pivot pin 54, substantially in the pivot plane of the p Iclaim:

1. A bolt for engaging an exposed surface and a blind surface and havinga pair or" component parts, each part having a threaded end and atapered shank extending axially from said end, each of said shankshaving a laterally extending toe adapted to engage said blind surface,and a pivot pin engaging said parts substantially in the plane common tosaid ends and said shanks and having at least one of its ends extendingbeyond said parts, whereby said bolt engages the rim of a hole in saidexposed surface and is prevented from passing through said hole.

2. The combination set forth in claim 1 and further characterized byboth ends of said pivot pin extending beyond said parts.

3. The combination set forth in claim 1 and further characterized by thesaid pin being formed on the inner surface of one of said parts a 1dextending from said part loosely through and beyond the surface of theother of said parts.

References Cited in the file of this patent UNITED STATES PATENTS

